Have I heard of water/waste coming out of a roof terminal

Could it be soap suds possibly?

Try using plain water no clothes and see if it comes out of the vent I reckon anything is possible

Thanks for your reply, but I'm one step ahead of ya...I tried plain water running in kitchen, bathrooms, showers, and washer. The washer is the culprit...and plain water runs out of the roof pipe. It sure is baffling me....

Where is the washer located in the house?

How is it connected to the drain?

Where is this roof pipe?

Is the washer located on the 2nd floor and the vent pipe on a part of the house that is only one floor? That is the only way that I could see this happening.

Normally the washer drains into a standpipe, which is just an open pipe and there is no way for the water level to get any higher and the top of that standpipe.

Or does it connect to a basin pump or sewer ejector pump? And if so where do they connect into the drain system?

The last time I was in plumbing school

(plumbing 101) the instructor said something about water seeking its own level.

So using this lodgic one has to wonder where the roof terminal (vent) is in relation to the washer as water normally does not flow up hill.

Very intreasting as if the main line was blocked the water should have poured either out of the kitchen sink or the top of washing machine ANY point lower then the roof vent.

PLEASE keep me posted as I am curious as to how,why this could happen

Ive seen this several times....someone has sealed the outlet hose from the washer to the drain-pipe because it was backing up or starting to back up......now time goes by and there is a complete stoppage and when the pump kicks in to drain the washer it simply pumps the water to the path of least resistance.....up the vent.. exiting on the roof. erik

I guess the installer did not go to school that day and read about protecting the potable water supply.

Thank you I just learned WHY the water could go up vent line.

well, the verdict is in...I've discovered after digging up the yard, that my 40+ year old home had a graywater system installed which had become blocked. And the water apparently had no where to go but up...the block was cleared after snaking through 18 feet from the roof and now there is a lovely little septic tank to pump out. It also appears that the distribution box is broken as well [cha ching cha ching]...who would'a known?

I just hired a helper @ $25 per hr to start and If he doesn't work out would you consider a job?

Plumbing is a science but sometimes the theory just goes out the window.

that is why I told many folks plumbing is a never ending profession, thank you for getting back to us so I can learn.

HAVE A GREAT Week end